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AIM

10/12/17

4−3−23

Airport Operations

4−3−18. Taxiing

a. General. Approval must be obtained prior to

moving an aircraft or vehicle onto the movement area

during the hours an Airport Traffic Control Tower is

in operation.

1. Always state your position on the airport

when calling the tower for taxi instructions.

2. The movement area is normally described in

local bulletins issued by the airport manager or

control tower. These bulletins may be found in FSSs,

fixed base operators offices, air carrier offices, and

operations offices.

3. The control tower also issues bulletins

describing areas where they cannot provide ATC

service due to nonvisibility or other reasons.

4. A clearance must be obtained prior to taxiing

on a runway, taking off, or landing during the hours

an Airport Traffic Control Tower is in operation.

5. A clearance must be obtained prior to

crossing any runway. ATC will issue an explicit

clearance for all runway crossings.

6. When assigned a takeoff runway, ATC will

first specify the runway, issue taxi instructions, and

state any hold short instructions or runway crossing

clearances if the taxi route will cross a runway. This

does not authorize the aircraft to “enter” or “cross”

the assigned departure runway at any point. In order

to preclude misunderstandings in radio communica-

tions, ATC will not use the word “cleared” in

conjunction with authorization for aircraft to taxi.

7. When issuing taxi instructions to any point

other than an assigned takeoff runway, ATC will

specify the point to taxi to, issue taxi instructions, and

state any hold short instructions or runway crossing

clearances if the taxi route will cross a runway.

NOTE−

ATC is required to obtain a readback from the pilot of all

runway hold short instructions.

8. If a pilot is expected to hold short of a

runway approach/departure (Runway XX APPCH/

Runway XX DEP) hold area or ILS holding position

(see FIG 2−3−15, Taxiways Located in Runway

Approach Area), ATC will issue instructions.

9. When taxi instructions are received from the

controller, pilots should always read back:

(a) The runway assignment.
(b) Any clearance to enter a specific runway.
(c) Any instruction to hold short of a specific

runway or line up and wait.
Controllers are required to request a readback of

runway hold short assignment when it is not received

from the pilot/vehicle.

b. ATC clearances or instructions pertaining to

taxiing are predicated on known traffic and known

physical airport conditions. Therefore, it is important

that pilots clearly understand the clearance or

instruction. Although an ATC clearance is issued for

taxiing purposes, when operating in accordance with

the CFRs, it is the responsibility of the pilot to avoid

collision with other aircraft. Since “the pilot−in−com-

mand of an aircraft is directly responsible for, and is

the final authority as to, the operation of that aircraft”

the pilot should obtain clarification of any clearance

or instruction which is not understood.

REFERENCE−

AIM, Paragraph 7−3−1 , General

1. Good operating practice dictates that pilots

acknowledge all runway crossing, hold short, or

takeoff clearances unless there is some misunder-

standing, at which time the pilot should query the

controller until the clearance is understood.

NOTE−

Air traffic controllers are required to obtain from the pilot

a readback of all runway hold short instructions.

2. Pilots operating a single pilot aircraft should

monitor only assigned ATC communications after

being cleared onto the active runway for departure.

Single pilot aircraft should not monitor other than

ATC communications until flight from Class B,

Class C, or Class D surface area is completed. This

same procedure should be practiced from after receipt

of the clearance for landing until the landing and taxi

activities are complete. Proper effective scanning for

other aircraft, surface vehicles, or other objects

should be continuously exercised in all cases.

3. If the pilot is unfamiliar with the airport or for

any reason confusion exists as to the correct taxi

routing, a request may be made for progressive taxi

instructions which include step−by−step routing

directions. Progressive instructions may also be

issued if the controller deems it necessary due to

traffic or field conditions (for example, construction

or closed taxiways).

3/29/18

AIM